Double oven



FIG. 1 is a frontal perspective view of the design of the front panel and doors of a built-in double oven showing the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a right side elevational view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design of a double oven, as shown and described. 